| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_RUNTIME_STACK_INDIRECT_REFERENCE_TABLE_H_ |
| #define ART_RUNTIME_STACK_INDIRECT_REFERENCE_TABLE_H_ |
| |
| #include "base/logging.h" |
| #include "base/macros.h" |
| #include "stack.h" |
| #include "utils.h" |
| |
| namespace art { |
| namespace mirror { |
| class Object; |
| } |
| class Thread; |
| |
| // Stack allocated indirect reference table. It can allocated within |
| // the bridge frame between managed and native code backed by stack |
| // storage or manually allocated by SirtRef to hold one reference. |
| class StackIndirectReferenceTable { |
| public: |
| explicit StackIndirectReferenceTable(mirror::Object* object) : |
| link_(NULL), number_of_references_(1) { |
| references_[0].Assign(object); |
| } |
| |
| ~StackIndirectReferenceTable() {} |
| |
| // Number of references contained within this SIRT. |
| uint32_t NumberOfReferences() const { |
| return number_of_references_; |
| } |
| |
| // We have versions with and without explicit pointer size of the following. The first two are |
| // used at runtime, so OFFSETOF_MEMBER computes the right offsets automatically. The last one |
| // takes the pointer size explicitly so that at compile time we can cross-compile correctly. |
| |
| // Returns the size of a StackIndirectReferenceTable containing num_references sirts. |
| static size_t SizeOf(uint32_t num_references) { |
| size_t header_size = OFFSETOF_MEMBER(StackIndirectReferenceTable, references_); |
| size_t data_size = sizeof(StackReference<mirror::Object>) * num_references; |
| return header_size + data_size; |
| } |
| |
| // Get the size of the SIRT for the number of entries, with padding added for potential alignment. |
| static size_t GetAlignedSirtSize(uint32_t num_references) { |
| size_t sirt_size = SizeOf(num_references); |
| return RoundUp(sirt_size, 8); |
| } |
| |
| // Get the size of the SIRT for the number of entries, with padding added for potential alignment. |
| static size_t GetAlignedSirtSizeTarget(size_t pointer_size, uint32_t num_references) { |
| // Assume that the layout is packed. |
| size_t header_size = pointer_size + sizeof(number_of_references_); |
| // This assumes there is no layout change between 32 and 64b. |
| size_t data_size = sizeof(StackReference<mirror::Object>) * num_references; |
| size_t sirt_size = header_size + data_size; |
| return RoundUp(sirt_size, 8); |
| } |
| |
| // Link to previous SIRT or NULL. |
| StackIndirectReferenceTable* GetLink() const { |
| return link_; |
| } |
| |
| void SetLink(StackIndirectReferenceTable* sirt) { |
| DCHECK_NE(this, sirt); |
| link_ = sirt; |
| } |
| |
| // Sets the number_of_references_ field for constructing tables out of raw memory. Warning: will |
| // not resize anything. |
| void SetNumberOfReferences(uint32_t num_references) { |
| number_of_references_ = num_references; |
| } |
| |
| mirror::Object* GetReference(size_t i) const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| DCHECK_LT(i, number_of_references_); |
| return references_[i].AsMirrorPtr(); |
| } |
| |
| StackReference<mirror::Object>* GetStackReference(size_t i) |
| SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| DCHECK_LT(i, number_of_references_); |
| return &references_[i]; |
| } |
| |
| void SetReference(size_t i, mirror::Object* object) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| DCHECK_LT(i, number_of_references_); |
| references_[i].Assign(object); |
| } |
| |
| bool Contains(StackReference<mirror::Object>* sirt_entry) const { |
| // A SIRT should always contain something. One created by the |
| // jni_compiler should have a jobject/jclass as a native method is |
| // passed in a this pointer or a class |
| DCHECK_GT(number_of_references_, 0U); |
| return ((&references_[0] <= sirt_entry) |
| && (sirt_entry <= (&references_[number_of_references_ - 1]))); |
| } |
| |
| // Offset of link within SIRT, used by generated code |
| static size_t LinkOffset(size_t pointer_size) { |
| return 0; |
| } |
| |
| // Offset of length within SIRT, used by generated code |
| static size_t NumberOfReferencesOffset(size_t pointer_size) { |
| return pointer_size; |
| } |
| |
| // Offset of link within SIRT, used by generated code |
| static size_t ReferencesOffset(size_t pointer_size) { |
| return pointer_size + sizeof(number_of_references_); |
| } |
| |
| private: |
| StackIndirectReferenceTable() {} |
| |
| StackIndirectReferenceTable* link_; |
| uint32_t number_of_references_; |
| |
| // number_of_references_ are available if this is allocated and filled in by jni_compiler. |
| StackReference<mirror::Object> references_[1]; |
| |
| DISALLOW_COPY_AND_ASSIGN(StackIndirectReferenceTable); |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_RUNTIME_STACK_INDIRECT_REFERENCE_TABLE_H_ |